feat: implement searchable extension market function #13863

[Blessy7-eng]

Hello Dubbo Team,

I have finished the market expansion task that was asked in issue #13863. I aimed to make it easy to navigate and maintain the extension library.

Major Improvements:

Searchable Extension Table: Provided a searchable extension table allowing users to easily search for entries about available registries and protocols using keywords.

Data Driven Architecture: Data/extensions.yml and a Hugo shortcode for the table. Makes it very easy for the maintainers of the project to keep the extension info up to date without having to touch any of the HTML files directly.

Detailed Browsing in Action
The table is well-organized with easy-to-understand categories and versions of all the extensions included.

Feedback from the Community: A link was provided for submitting new ideas on how to expand the community.

Hugo has been tested on a local environment, and the search functionality and table rendering are functioning as needed.

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